If exercise wears you out，how can it be good for you?

　　Because our bodies adapt to everything we do to them.And as far as your body is concerned，it's “use it，or lose it”！It's not that exercise makes you healthy；it's more that a lack of exercise leaves your body weak and easily affected by disease.

　　1．What is the colour of blood in a vein near the surface of the skin?A．Blue.

　　B．Light yellow.

　　C．Red.

　　D．Dark reddish purple.

　　解析　细节理解题。根据第一个标题下的“...it's more of a dark reddish purple colour.”可知答案。

　　答案　D2．Why do some old people look a little shrunken as they age?

　　A．Because their spine is in active use.

　　B．Because they are more easily affected by gravity.

　　C．Because they keep growing backwards.

　　D．Because their spine becomes more bent.

　　解析　细节理解题。根据第四个标题下的“They simply lose height as their spine(脊柱) becomes shorter and more curved due to disuse and the effects of gravity(重力)．”可知，老年人变矮是因为脊柱收缩和弯曲造成的。

　　答案　D3．Which of the following statements about our brain is true?

　　A．In the long run，our brain probably works harder than our heart.

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